The winger, who joined Southampton’s Academy aged seven, has been linked to a move to the top flight all summer, with Arsenal and Manchester United as the front-runners.

Despite speculation, the London club has confirmed the signing of the youngster for an undisclosed fee.

"We are delighted that Alex has decided to join us,” Wenger told the club’s official website. “He is an exciting young player who will provide us with creativity and offensive quality. He can play as an attacking centre midfielder, or wide left and right."

The 17-year-old scored 10 goals for the Saints last season, helping them reach promotion to the Championship.

"Alex has done extremely well during his development with Southampton and we are looking forward to him progressing even further and fulfilling his huge potential with Arsenal Football Club,” Wenger added.

Despite the Gunners decision to keep quiet over the transfer fee, it is reported that Arsenal have paid in the region of £12m for the winger, according to Sky Sports News.

"I'm so excited to be joining Arsenal. It's a fantastic club and I'm really looking forward to the opportunity of playing football at the highest level,” Oxlade-Chamberlain said.

"Arsenal have a great manager in Arsène Wenger, top quality players and an attractive style of play. These were all important factors in me choosing to sign for Arsenal.

"I'm proud to be joining Arsenal, but I would also like to take this opportunity to thank everyone at Southampton for their help and support during the early part of my career, for which I will always be grateful. I'm now looking forward to meeting all my new team mates and giving absolutely everything in an Arsenal shirt."

Oxlade-Chamberlain is expected to begin training with the first-team squad at London Colney.